【正文】
ement to or several plans. In this stage, the question which only must consider about the choice of material is: Whether has the performance to conform to the request material to be possible to supply the choice。s basic responsibility is diligently causes the machine to adapt the people. This certainly is not an easy work, because the most superior operating area and the operating process to all do not exist in fact. Another important question, project engineer must be able to carry on the exchange the consultation with other concerned personnel. In the initial stage, designer has to exchange with administrator on the preliminary design, and be approved. This is generally through the oral discussion, with schematic diagram and the writing material. In order to carry on the effective exchange, needs to solve the following problem: (1) Whether product designed is truly needed for the people? (2) Whether this product has petitive ability pare with other pany’s existing similar products? (3) Whether this kind of product is economical? (4) Whether this product’s service convenient? (5) Whether this product sale well? Whether can gain?Only time be able to produce the correct answer to above question. But, the product design, the manufacture and the sale only can continue on foundation of the above question preliminary answered. Project engineer also should consult together with the branch of manufacture for the finally design proposal through the detail drawing and the assembly drawing.Usually, can have some problem in the manufacture process. Possibly can request to some ponents size or the mon difference makes some changes, causes the ponents the production to change easily. But, in the project change must have to pass through designs the personnel to authorize, guaranteed cannot damage the product the function. Sometimes, when in front of product assembly or in the packing foreign shipment experiment only then discovers in the design some kind of flaw. These instances exactly showed the design is a dynamic process. Always has a better method to plete the design work, designs the personnel to be supposed unceasingly diligently, and seeks this better method. Recent year, the engineering material choice already appeared importantly. In addition, the choice process should be to the material continuously the unceasing again appraisal process. The new material unceasingly appears, but some original materials can obtain the quantity possibly can reduce. The environmental pollution, material recycling aspect and so on use, worker39。 (c) uses the material data not entire perhaps some data are indefinite, works as its longterm performance data is the like this time in particular。發(fā)明、發(fā)現(xiàn)和科技知識本身并不一定能給人類帶來好處,只有當它們被應用在產(chǎn)品上才能產(chǎn)生效益。因此,一個性能優(yōu)越的產(chǎn)品誕生的同時,也伴隨著較高的風險。設計人員的基本職責是努力使機器來適應人們。通常 ,在制造過程中會出現(xiàn)某個問題。新材料不斷出現(xiàn),而一些原有的材料的能夠獲得的數(shù)量可能會減少。設計通常可以分為幾個明確的階段:(a)初步設計;(b)功能設計;(c)生產(chǎn)設計。應該結合產(chǎn)品的功能,認真仔細地考慮產(chǎn)品的外觀、成本和可靠性。經(jīng)驗表明,可采用某些便宜材料作為替代品。產(chǎn)品的責任訴訟迫使設計人員和公司在選擇材料時,采用最好